R547

Catalog No.S2688 Synonyms: Ro 4584820

R547 Chemical Structure

Molecular Weight(MW): 441.45

R547 is a potent ATP-competitive inhibitor of CDK1/2/4 with Ki of 2 nM/3 nM/1 nM. It is less potent to CDK7 and GSK3α/β, while inactive to other kinases. Phase 1.

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In DMSO USD 770 In stock
USD 470 In stock
USD 670 In stock
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Biological Activity

Description R547 is a potent ATP-competitive inhibitor of CDK1/2/4 with Ki of 2 nM/3 nM/1 nM. It is less potent to CDK7 and GSK3α/β, while inactive to other kinases. Phase 1.
Targets
CDK4/CyclinD1 [1]
(Cell-free assay)
CDK1/CyclinB [1]
(Cell-free assay)
CDK2/CyclinE [1]
(Cell-free assay)
1 nM(Ki) 2 nM(Ki) 3 nM(Ki)
In vitro

R547 identified as a diaminopyrimidine compound, which is a potent and selective ATP-competitive CDK inhibitor. R547 effectively inhibits CDK1/cyclinB, CDK2/cyclinE, and CDK4/cyclinD1(Ki=1-3nM) and is inactive(Ki>5,000nM) against a panel of >120 unrelated kinases. R547 effectively inhibits the proliferation of tumor cell lines independent of multidrug resistant status, histologic type, retinoblastoma protein, or p53 status, with IC50s <0.60 μM. R547 reduces phosphorylation of the cellular retinoblastoma protein at specific CDK phosphorylation sites at the same concentrations that induced cell cycle arrest, suggesting a potential pharmaco dynamics marker for clinical use. R547 inhibits the proliferation of tumor cell lines and is active in all 19 cell lines tested irrespective of tissue of origin, multidrug resistance (MDR), p53, or retinoblastoma status. [1] R547 possessing both 5-and 6-fluoro substitution culminated in an Inhibitor with low, single-digit nanomolar potency against the CDKs(Ki=0.001,0.003,and 0.001 μM for CDK1,CDK2, and CDK4,respectively) and excellent cellular potency (IC50=0.08 μM,HCT116 cell line). [2]

In vivo R547 administered with oral and i.v. dosing in multiple established human tumor significantly inhibits tumor activity(P < 0.01). R547 administered orally at dose of 40 mg/kg daily in colon, lung, breast, prostate, and melanoma human tumor xenograft models shows significant TGI (79-99%). R547 is equally efficacious (TGI, 61-95%) when dosed with 40 mg/kg i.v. once weekly. These doses of R547 are not toxic and did not result in body weight loss. R547 does not show signs of overt toxicity during the course of the 3-week study and any gross pathology at necropsies done at the end of the studies. [1] R547 inhibits tumor growth up to 95% in the HCT116 human colorectal tumor xenograft model in nude mice . R547 causes significant TGI in all of the models tested when dosed orally and i.v. at or below the maximum tolerated dose. R547 inhibits phosphorylation of retinoblastoma protein in tumors at the efficacious exposures in tumor xenograft models, providing a pharmacodynamic biomarker for clinical use. R547 reported here suggests that this is a promising molecule for evaluation in the treatment of solid tumors. [2]

Protocol

Animal Research:

[2]

+ Expand
  • Animal Models: female nude mice bearing established HCT116 human colorectal xenografts with a mean starting volume of about 100 mm3
  • Formulation: suspension 1% Klucel LF in water with 0.1% Tween 80
  • Dosages: 25 ,50,75 mg/kg
  • Administration: Orally three times per week on Monday, Wednesday, and Friday for 18days
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 60 mg/mL (135.91 mM)
Water Insoluble
Ethanol Insoluble
In vivo Add solvents individually and in order:
1% hydroxyethyl cellulose+0.2% Tween 80
30 mg/mL

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 441.45
Formula

C18H21F2N5O4S

CAS No. 741713-40-6
Storage powder
Synonyms Ro 4584820

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID